One South Dearborn's Tenant® Portal: Property Management
Property Management
Property Management

One South Dearborn is staffed with professionally trained property management and engineering personnel. We are here to answer any questions you may have about the building or its operation. Please feel free to call or stop by with any comments or concerns that you may have. The Management Office, located on the 7th floor, is open on Monday through Friday from 8:00 a.m. - 5:00 p.m. Please contact Building Security at (312) 386-8316 for any after-hours questions.

Management and Leasing:

Management Office
1 S. Dearborn St. Suite 700
Chicago IL 60603
Phone: (312) 386-8300
Fax: (312) 386-8398

Important Numbers:

Lobby Security Desk (312) 386-8316 or (312) 386-8326
Messenger Office (312) 386-8317
Dock Office (312) 386-8318
Parking Office (312) 386-8319
Engineering Office (312) 386-8308

Building Service Hours:

Janitorial Staff Monday - Friday: 7am - 1am
Sunday: 8am - 4pm
Messenger Center Monday - Friday: 7am - 6pm
Saturday & Sunday: Closed
Parking Office Monday - Friday: 6am - 8pm
Saturday & Sunday: Closed
Engineering Office Monday - Friday: 6am - 10pm
Saturday & Sunday: 7am - 3pm
Security Staff 24/7

Hours are subject to change on holidays. Notice will be given prior to any changes.